<!--
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <script type="text/javascript">
        //alert(!1);    //false
        //alert(1==true);  //true
    alert(!1=="true");  //!运算符的优先级高于==
  </script>
  </body>
</html>
